Defer suspend events on Android when audio is active.

base/power_monitor/power_monitor.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_POWER_MONITOR_POWER_MONITOR_H_
 #define BASE_POWER_MONITOR_POWER_MONITOR_H_
 
 #include "base/base_export.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/power_monitor/power_observer.h"
+#include "build/build_config.h"
+
+#if defined(OS_ANDROID)
+#include "base/synchronization/lock.h"
+#endif
 
 namespace base {
 
 class PowerMonitorSource;
 
 // A class used to monitor the power state change and notify the observers about
 // the change event.
 class BASE_EXPORT PowerMonitor {
  public:
   // Takes ownership of |source|.
   explicit PowerMonitor(std::unique_ptr<PowerMonitorSource> source);
   ~PowerMonitor();
 
   // Get the process-wide PowerMonitor (if not present, returns NULL).
   static PowerMonitor* Get();
 
   // Add and remove an observer.
   // Can be called from any thread.
   // Must not be called from within a notification callback.
   void AddObserver(PowerObserver* observer);
   void RemoveObserver(PowerObserver* observer);
 
   // Is the computer currently on battery power.
   bool IsOnBatteryPower();
 
+#if defined(OS_ANDROID)
+  void DeferSuspendEvents(bool defer);
+#endif
+
  private:
   friend class PowerMonitorSource;
 
   PowerMonitorSource* Source();
 
   void NotifyPowerStateChange(bool battery_in_use);
   void NotifySuspend();
   void NotifyResume();
 
   scoped_refptr<ObserverListThreadSafe<PowerObserver> > observers_;
   std::unique_ptr<PowerMonitorSource> source_;
 
+  base::Lock lock_;
+  bool is_suspended_ = false;
+  bool should_defer_suspend_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(PowerMonitor);
 };
 
 }  // namespace base
 
 #endif  // BASE_POWER_MONITOR_POWER_MONITOR_H_